Device for applying beading to stitched end bag



June 12, 1962 w. T. LESLIE 3,033,427

DEVICE FOR APPLYING BEADING TO STITCHED END BAG Filed April 1, 1960 2Sheets-Sheet 1 WINVENTOR. E6, 2, W/LL/AM Z'LEsL/K,

ATTOBNEY5 June 12, 1962 w, LESLIE 3,038,427

DEVICE FOR APPLYING BEADING TO STITCHED END BAG Filed April 1, 1960 2Sheets-Sheet 2 VIIIIIIIIIIIIIIIIIIIA/ INVENTOR .Fi' 6. W/LL/AM T LEsL/s,

ATTORNEYS.

tates This invention relates to stitched end bags and to stitchingmachines for applying such stitching and more particularly to a devicefor use in conjunction with such stitching machines to present analigned heading for incorporation in the stitched ends of the bags,thereby producing bags in which the lines of stitching are sealed by theinterposed beading.

In the manufacture of certain types of bags a plurality of webs of paperare folded longitudinally one about the other into tubular form and thenested tubes are cut into bag lengths which are then delivered one at atime to sewing machines which stitch both ends of each bag length tocompletely close the bag With the exception of a filling opening orvalve adjacent one end thereof. Usually, binding tapes are folded aboutthe ends of the bag lengths and sewed thereto simultaneously with thestitching of the ends of the bag lengths. Bags formed in this manner areextensively used for packaging and shipping commodities of variouskinds, including finely divided or powdered materials, such as cement,lamp black and the like. Such bags are not, however, entirelysatisfactory when used with very fine materials in that such materialstend to sift through the perforations formed Where the stitching passesthrough the bag walls. While various expedients have hitherto beenproposed for overcoming this difficulty, none of them has been whollysatisfactory. It has been proposed, for example, to apply gummed tapeover the line of stitching to thereby seal it against leakage.Considerable difficulty has been experienced in effecting a tight bondbetween the gummed surface of the tape and the bag end, with the resultthat in use the tape tends to come loose and peel away, and leakagestill occurs. It has been suggested that beading, i.e., loosely braidedrope-like material, usually formed from cotton strands, be incorporatedin the line of stitching to assist in sealing the perforations made bythe sewing machine needle as it stitches the bag. Such beading is fedbeneath the pressure foot of the sewing machine and, as the line ofstitching is formed, the beading is stitched to the outside of the bagand hence overlies the tape. While this arrangement prevents thematerial from sifting through the perforation in the tape, I have foundthat leakage still occurs, the material in the bag sifting through theperforations in the bag walls and thence outwardly between the bag Wallsand the tape.

In accordance with the instant invention, I have found that a sift-proofcondition can be obtained where the beading directly overlies theoutermost bag wall and is covered by the tape, the stitching passingthrough the tape, the beading, and the bag walls. Where this is done,the beading effectively seals the perforations in the outermost bag walland leakage is thereby prevented. Such arrangement required that thebeading be interposed between the bag Wall and the tape prior tostitching.

Accordingly, a principal object of the instant invention is theprovision of a device which in a continuous operation will present andfeed beading into proper position on one or both sides of a bag tube,simultaneously present and feed a length of tape into position and foldit about the bag end with the beading underlying the tape, the deviceacting to present the properly positioned and oriented tape and beadingto the sewing machine for stitching.

atent 3,638,427 Patented June 12, I962 Still a further object of theinvention is the provision of a device of the character described whichis simple in construction and yet positive in action, and which insuresthat the beading will be properly aligned for subsequent stitching.

Still a further object of the invention is the provision of a stitchedend bag in which a line of heading is incorporated in the stitching, thebeading lying between the outermost ply of the bag and the tape.

The foregoing, together with other objects of the invention which willappear hereinafter or which will be apparent to the skilled worker inthe art upon reading these specifications, I accomplish by thatconstruction and arrangement of parts of which I will describe asexemplary embodiment.

Reference is now made to the accompanying drawings wherein:

FIGURE 1 is a fragmentary plan View of a bag sewing machineincorporating the beading applicator of the instant invention.

FIGURE 2 is an enlarged side elevational View of the beading applicatorand tape folding means.

FIGURE 3 is an enlarged fragmentary side elevational view illustratingthe application of the heading.

FIGURE 4 is an end elevational view taken from the right of FIGURE 2.

FIGURE 5 is a vertical sectional view taken along the line 5-5 of FIGURE3.

FIGURE 6 is a perspective view of a stitched end multiple wall bag.

FIGURE 7 is an enlarged fragmentary sectional view taken along the line'7-7 of FIGURE 6.

FIGURE 8 is a sectional view similar to FIGURE 7 but illustrating adouble row of heading lying on both sides of the tape.

FIGURE 9 is a fragmentary perspective view of a sewing machine footequipped with a beading feeding tube.

In the drawings I have illustrated the beading applying device inconnection With a bag sewing machine of a well known type, but it is tobe understood that the device may take various forms and may be used inconnection with sewing machines of various kinds.

Referring now to FIGURE 1, I have therein shown a a portion of a bagsewing machine comprising a supporting frame 1 on which is mounted asewing head 2 which is driven from a power shaft 3 connected to anysuitable source of power. The bags 4 are moved to and beyond the sewinghead in spaced apart relation by means of an endless conveyor, one chainof which is shown at 5, the conveyor being provided with lugs 6 engagingthe rear or trailing edges of the bag lengths.

"Mounted on the frame 1 in advance of the sewing head is the tape andbeading applicator, indicated generally at 7, which continuously folds asealing tape about the ends of the bags as they move to the sewing head,the tape being sewed to the bags by the same stitching which closes theends of the bags. The tape 8 is drawn from a source of supply through apaste applying mechanism 9, about an upright roller 10 which moves thetape to an edge-wise upright position from which it is then drawnthrough a folding member or sweep 11 which folds it about the ends ofthe bag; and after the tape has once been connected to a bag, it isdrawn continuously from the source of supply as successive bags move tothe sow ing head. The mechanism for applying the heading is an integralpart of the applicator 7, the details of which will be explained morefully hereinafter. Subsequent to the application of the tape andbeading, the sewed bags are connected together by a continuous length oftape, and a cutting device 12 is provided beyond the sewing head tosever the tape and heading between adjacent bags, the cutting deviceacting in timed relation to the 3 movement of the bag lengths. While notillustrated, it is to be understood that a like arrangement of partswill be provided on the opposite side of the frame I for closing andstitching the opposite end of each bag tube, as will be well understoodby the skilled worker in the art.

As seen in FIGURE 2, the applicator 7 is provided with an elongated,narrow platform 13 adapted to support the end of each bag and align itmidway between the upper and lower edges of the tape 8 as the tape movesend-wise about the upright roller 10*. As the tape passes along thefolding member Ill, it contacts the inclined portons 11a and 11!)thereof which act to fold the opposite side edges of the tape about theend of each bag. In accordance with the instant invention, a pair offeeding tubes 14 and 15 are positioned in advance of the inclinedportions 11a, 11b, the tubes being inclined toward each other with theirinner ends positioned for near contact with a bag end being advancedalong the platform 13. Thus, as seen in FIGURE 3, the feeding tubes 14and 15 will serve to juxtapose continuous lengths of beading 16 and 16ato opposite sides of a bag length 4 as the latter passes beyond theplatform and just prior to the time the inclined portions 11a and 11b ofthe folding member juxtapose the opposite side edges of the tape 8 tothe opposite side of the bag tube. As in the case of tape 8, after thelengths of heading 16, 160 have been connected to the leading bag, theywill be continuously drawn from the source of supply as successive bagsmove to the sewing head. While for purposes of simplicity the bag length4 illustrated in FIGURE 3 is shown as a single ply bag, it will beunderstood that most stitched end bags are of multiwall construction,being composed of a plurality of tubular plies.

Since the beading 16, 16a is of substantial mass, even when compacted,it has been found desirable to provide channels 18, 18a in the inclinedportions 11, 11a of the folding device which, as seen in FIGURE 4, arein alignment with the applied beading. These channels serve to deformthe tape 8 to thereby provide continuous longitudinal pockets 19, 1%(see FIG. 5) in the folded tape 8, the pockets receiving the lengths ofbeading 16, 16a. It will be understood, of course, that the feedingtubes 14 and 15 will be positioned so as to apply the beading in properalignment so that the line of stitching applied by the sewing head 2Will pass through the beading, thereby stitching together the bag end,the beading, and the tape, all in a continuous operation. As should nowbe apparent, the instant device provides a very efficient means forapplying beading to the end of the bag lengths in the area beneath thetape and properly aligning it for contact by the stitching. Since theheading will lie next to the outermost bag ply it serves to effectivelyseal the perforations formed by the stitching as it passes through theplies, and at the same time the beading is covered and protected by thetape. Since the tape itself is stitched to the bag, it will not pull offeven though the adhesive bond fails. Subsequent to stitching, the cutter12, which severs the tape in the intervals between adjacent bags, alsowill be utilized to sever the beading, thereby separating the bags fromeach other.

A completed bag is shown at 20 in FIGURE 6, the ends of the bag beingsealed by lines of stitching 21 passing through the ends of the bag, thebeading 16, 16a and the tape 8. As best seen in FIGURE 7, the stitchingoperation tends to flatten the beading and, as will be evident, thebeading surrounds and closes the perforations in the bag tube formed bythe stitching needle. The beading thus effectively seals perforationsagainst material seeking to sift therethrough.

As illustrated in FIGURE 8, it is within the spirit and purpose of theinvention to provide additional rows of beading overlying the tape andheld in place by the lines of stitching, such additional beading beingindicated at 22 and 22a. This arrangement provides a double seal againstmaterial seeking to sift from the bags. The beading 22, 22a may beconveniently applied as a part of the continuous machine operation byproviding the pressure foot of each sewing machine with a feeding tube23, as seen in FIGURE 9, the tube being secured to the foot 24 andpositioned to juxtapose the beading beneath the needle 25, the beadingpassing beneath the foot 24 and being stitched in alignment with theinner beading 16. On the underside the beading 22a is fed into positionby means of a groove 26 in the feeding dog 27, which dog is part of thestandard sewing machine.

If desired, the beading and thread may be passed through a waterproofingsolution prior to sewing, to thereby provide an even more efficientclosure. Alternatively, the beading and thread may be formed frominherently waterproof material, such as nylon and the like.

Having thus described my invention in an exemplary embodiment, and withthe understanding that modifications may be made without departing fromthe spirit and the purpose of it, what I desire to secure and protect byLetters Patent is:

1. In a bag stitching machine wherein the ends of flat folded tubularbag bodies are advanced beneath a sewing head for stitching, a combinedtape and beading applicator positioned in advance of the sewing head,said applicator comprising a horizontally disposed platform of a size toreceive and support the ends of bag tubes advanced toward the sewinghead, means for delivering a continuous length of tape to an endwiseposition adjacent said platform with a longitudinal edge of saidplatform extending lengthwise of the tape intermediate its opposite sideedges, sweep means for infolding the opposite side edges of the tapeabout the ends of the bag tubes as the bag tubes are advanced over saidplatform, said sweep means consisting of a plate the leading edge ofwhich is vertically disposed, said plate being gradually turned inwardlyfrom top and bottom and terminating at its trailing end in ahorizontally disposed nip of a size to cause the opposite side edges ofthe tape drawn therethrough to be juxtaposed to opposite sides of thebag tubes as the tubes pass through said nip, feeding means in advanceof said nip for feeding continuous lengths of beading into contact withopposite sides of the bag lengths, said feeding means comprising anelongated pair of tubular members lying within the confines of theinturned sweep and arranged to converge on opposite sides of the bagtubes in an area intermediate the trailing end of said platform and thenip of said sweep, and a pair of channels formed in the nip of saidsweep in alignment with the discharge ends of said tubular members, saidchannels extending away from the surfaces of said sweep contacting thetape and acting to form continuous longitudinal pock ets in the tapeoverlying the length of beading fed into contact with the bags, saidchannels coacting with said tubular members to maintain the lengths ofbeading in vertical alignment, whereby a single line of stitching may bepassed through both sides of the tape and the lengths of beading coveredthereby.

2. In combination in a bag stitching machine, a sewing head, conveyormeans for sequentially presenting the ends of flat folded tubular bagbodies to said sewing head for the application of a single line ofstitching across the ends of said bag bodies, a tape and bead applicatormounted in advance of said sewing head, said applicator comprising ahorizontally disposed platform positioned to support the ends of bagtubes advanced toward the sewing head, means for delivering a continuouslength of tape to an endwise position adjacent said platform with alongitudinal edge of the platform extending lengthwise of the tapeintermediate its opposite side edges, said last named means includingmeans for applying adhesive to the surface of the tape facing saidplatform, sweep means for infolding the opposite side edges of the tapeabout the ends of the bag tubes as the tubes are advanced over saidplatform, said sweep means comprising an elongated member having aleading edge which is essentially vertically disposed and mounted inclose proximity to the longitudinal edge of said platform but spacedtherefrom by a distance sufficient to permit the tape to passtherebetween, said elongated sweep member being gradually turnedinwardly from top and bottom and terminating at its trailing end in ahorizontally disposed nip of a size to cause the opposite side edges ofthe tape drawn therethrough to be juxtaposed to the opposite sides ofthe bag tube as they pass through said nip, said nip lying beyond thetrailing end of said platform in general horizontal alignment therewith,a pair of elongated tubular members positioned to feed continuouslengths of beading into contact with opposite sides of the bag tubes invertical alignment, said tubular members lying within the confines ofthe inturned portions of said sweep and positioned with their dischargeends in close proximity to the path of travel of the bag tubes as theypass from said platform to the nip of said sweep, and mating channelsformed in the upper and lower surfaces of said sweep means in the areaof said nip in alignment with the discharge ends of said tubularmembers, said channels acting to form continuous longitudinallyextending pockets in the infolded sides of the tape positioned tosurround the lengths of beading, with the channels and the lengths ofheading contained therein in vertical alignment so that a single line ofstitching may be concurrently passed through the tape and beading.

References Cited in the file of this patent UNITED STATES PATENTS1,508,695 Hill Sept. 16, 1924 1,764,846 Maier June 17, 1930 1,860,339 LeVesconte May 24, 1932 2,115,282 Potdevin Apr. 26, 1938 2,242,857 FortuinMay 20, 1941 2,512,048 Althofi June 20, 1950 2,594,207 Pierce Apr. 22,1952 2,847,955 Peterson Aug. 19, 1958

